That's dramatically overblown and incorrect (and rather insulting to trained professionals whom you apparently know nothing about). Many perscription drigs do come in blister packs in the US, but you may not have seen them because it's generally only the ones that are nearly always perscribed in the same amount - a Zithromax Z-Pack for example.

Any other medication coming in blister packs wouldn't change a darned thing, unless you expect pharmacies to carry large quantities of sealed 5,10,15,20 etc etc dose packs. If they didn't, they'd still be breaking the sealed packs up and counting to match the perscribed amount.